Payroll Calculation at Social Insurance Labor Consultant Offices Reduced from 2 Weeks to 2 Days - Case Studies of 'Yohakuru,' AI-Powered Support for Social Insurance Labor Consultants, Released
Lean Stack Co., Ltd. has released two case studies for its AI and DX accompanying support service "Yohakuru," targeting social insurance labor consultant offices. One case demonstrates a reduction in payroll calculation time from two weeks to two days with zero human errors. The second case highlights a tenfold reduction in the time required for creating and checking employment regulations.
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- 📰 Published: March 31, 2026 at 19:00
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Lean Stack Co., Ltd. (Headquarters: Chuo-ku, Osaka; Representative Director: Yuki Fukiage) has released details of two case studies for "Yohakuru," its AI and DX accompanying support service for social insurance labor consultant (Sharoushi) offices.
"Yohakuru," an AI-powered accompanying support service that "creates room in operations."
These are two cases: one where the time required for payroll calculation was reduced to one-fifth of the conventional time, eliminating human errors, and another where the time for creating and checking employment regulations was reduced to one-tenth.
**■ Case Study ①**
Four Seasons Social Insurance Labor Consultant Corporation
Payroll Calculation: Reduced from 2 weeks to 2 days, significant reduction in human errors.
Mr. Horiuchi, Representative of Four Seasons Social Insurance Labor Consultant Corporation
[Challenges Before Introduction]
Monthly payroll calculation took two weeks, and human errors due to input mistakes and transcription omissions occurred frequently. Late-night and all-night work became routine at the end of each month, leading to staff exhaustion and quality risks, which were serious management issues.
[Changes After Introduction]
● Time for payroll calculation: Reduced to approximately one-fifth of the conventional time (manual input that took 2 weeks is now completed in 2 days)
● Human errors: Zero (no errors occurred after introduction)
● Monthly late-night and all-night work: Completely eliminated
The business flow was visualized to identify processes that AI could handle.
Accompanying support was provided from introduction to operational stabilization.
**■ Case Study ②**
Asterisk Social Insurance Labor Consultant Office
Creation and checking of employment regulations: Time reduced to one-tenth.
Mr. Tsutsui, Representative of Asterisk Social Insurance Labor Consultant Office
[Challenges Before Introduction]
The creation, revision, and checking of employment regulations were all performed visually.
Staff spent a lot of time on these tasks, carrying the risk of oversight, which put pressure on other operations.
[Changes After Introduction]
● Time required for checking and creating employment regulations: Reduced to approximately one-tenth of the conventional time
● Transitioned from visual confirmation to AI-assisted checking, achieving standardization of quality.
A system for AI-powered initial draft checking and issue extraction was established.
This created a structure where social insurance labor consultants can concentrate on their core duties.
■ About Yohakuru
"Yohakuru" is an accompanying AI support service aimed at improving the operational efficiency and quality of social insurance labor consultant offices.
It provides consistent support from introduction to stabilization, enabling offices without specialized AI/DX knowledge to utilize generative AI in a way that aligns with their on-site business flows.
Service website: https://www.yohakuru.com/
■ About Lean Stack Co., Ltd.
Company Name: Lean Stack Co., Ltd.
Representative Director: Yuki Fukiage
Location: 2-2-13-3F Tokui-cho, Chuo-ku, Osaka-shi, Osaka
Established: September 4, 2023
Business Activities: DX promotion/AI implementation support for SMEs and professional firms, system development
Company Website: https://leanstack-buzz.com/
■ Inquiries regarding this matter
Lean Stack Co., Ltd. Yohakuru Secretariat Service Website: https://www.yohakuru.com/
Operating Company: https://leanstack-buzz.com/
* For inquiries about introduction or media coverage, please use the inquiry form on the service website.
"Yohakuru," an AI-powered accompanying support service that "creates room in operations."
These are two cases: one where the time required for payroll calculation was reduced to one-fifth of the conventional time, eliminating human errors, and another where the time for creating and checking employment regulations was reduced to one-tenth.
**■ Case Study ①**
Four Seasons Social Insurance Labor Consultant Corporation
Payroll Calculation: Reduced from 2 weeks to 2 days, significant reduction in human errors.
Mr. Horiuchi, Representative of Four Seasons Social Insurance Labor Consultant Corporation
[Challenges Before Introduction]
Monthly payroll calculation took two weeks, and human errors due to input mistakes and transcription omissions occurred frequently. Late-night and all-night work became routine at the end of each month, leading to staff exhaustion and quality risks, which were serious management issues.
[Changes After Introduction]
● Time for payroll calculation: Reduced to approximately one-fifth of the conventional time (manual input that took 2 weeks is now completed in 2 days)
● Human errors: Zero (no errors occurred after introduction)
● Monthly late-night and all-night work: Completely eliminated
The business flow was visualized to identify processes that AI could handle.
Accompanying support was provided from introduction to operational stabilization.
**■ Case Study ②**
Asterisk Social Insurance Labor Consultant Office
Creation and checking of employment regulations: Time reduced to one-tenth.
Mr. Tsutsui, Representative of Asterisk Social Insurance Labor Consultant Office
[Challenges Before Introduction]
The creation, revision, and checking of employment regulations were all performed visually.
Staff spent a lot of time on these tasks, carrying the risk of oversight, which put pressure on other operations.
[Changes After Introduction]
● Time required for checking and creating employment regulations: Reduced to approximately one-tenth of the conventional time
● Transitioned from visual confirmation to AI-assisted checking, achieving standardization of quality.
A system for AI-powered initial draft checking and issue extraction was established.
This created a structure where social insurance labor consultants can concentrate on their core duties.
■ About Yohakuru
"Yohakuru" is an accompanying AI support service aimed at improving the operational efficiency and quality of social insurance labor consultant offices.
It provides consistent support from introduction to stabilization, enabling offices without specialized AI/DX knowledge to utilize generative AI in a way that aligns with their on-site business flows.
Service website: https://www.yohakuru.com/
■ About Lean Stack Co., Ltd.
Company Name: Lean Stack Co., Ltd.
Representative Director: Yuki Fukiage
Location: 2-2-13-3F Tokui-cho, Chuo-ku, Osaka-shi, Osaka
Established: September 4, 2023
Business Activities: DX promotion/AI implementation support for SMEs and professional firms, system development
Company Website: https://leanstack-buzz.com/
■ Inquiries regarding this matter
Lean Stack Co., Ltd. Yohakuru Secretariat Service Website: https://www.yohakuru.com/
Operating Company: https://leanstack-buzz.com/
* For inquiries about introduction or media coverage, please use the inquiry form on the service website.